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< meta name = "description" content = "A fullstack but simple mail-server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker." >
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< title > Debugging - Docker Mailserver< / title >
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Docker Mailserver
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Debugging
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Initializing search
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docker-mailserver
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Home
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Introduction
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Usage
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Configuration
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Examples
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Contributing
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DockerHub
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GHCR
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Docker Mailserver
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 496 512" > <!-- ! Font Awesome Free 6.3.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc. --> < path d = "M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z" / > < / svg >
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docker-mailserver
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< a href = "../.." class = "md-nav__link" >
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Home
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< a href = "../../introduction/" class = "md-nav__link" >
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Introduction
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< a href = "../../usage/" class = "md-nav__link" >
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Usage
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< label class = "md-nav__link" for = "__nav_4" id = "__nav_4_label" tabindex = "0" >
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Configuration
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< nav class = "md-nav" data-md-level = "1" aria-labelledby = "__nav_4_label" aria-expanded = "true" >
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< label class = "md-nav__title" for = "__nav_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Configuration
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../environment/" class = "md-nav__link" >
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Environment Variables
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< li class = "md-nav__item" >
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< a href = "../user-management/" class = "md-nav__link" >
User Management
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_3" >
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< label class = "md-nav__link" for = "__nav_4_3" id = "__nav_4_3_label" tabindex = "0" >
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Best Practices
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_3_label" aria-expanded = "false" >
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< span class = "md-nav__icon md-icon" > < / span >
Best Practices
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< li class = "md-nav__item" >
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< a href = "../best-practices/dkim/" class = "md-nav__link" >
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DKIM
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< / li >
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< li class = "md-nav__item" >
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< a href = "../best-practices/dmarc/" class = "md-nav__link" >
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DMARC
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< li class = "md-nav__item" >
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< a href = "../best-practices/spf/" class = "md-nav__link" >
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SPF
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< / li >
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< li class = "md-nav__item" >
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< a href = "../best-practices/autodiscover/" class = "md-nav__link" >
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Auto-discovery
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< / ul >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_4" >
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< label class = "md-nav__link" for = "__nav_4_4" id = "__nav_4_4_label" tabindex = "0" >
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Security
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< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_4_label" aria-expanded = "false" >
< label class = "md-nav__title" for = "__nav_4_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Security
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< ul class = "md-nav__list" data-md-scrollfix >
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< a href = "../security/understanding-the-ports/" class = "md-nav__link" >
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Understanding the Ports
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< li class = "md-nav__item" >
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< a href = "../security/ssl/" class = "md-nav__link" >
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SSL/TLS
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< li class = "md-nav__item" >
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< a href = "../security/fail2ban/" class = "md-nav__link" >
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Fail2Ban
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< li class = "md-nav__item" >
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< a href = "../security/mail_crypt/" class = "md-nav__link" >
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Mail Encryption
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< li class = "md-nav__item" >
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< a href = "../security/rspamd/" class = "md-nav__link" >
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Rspamd
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< / ul >
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< li class = "md-nav__item md-nav__item--active" >
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< input class = "md-nav__toggle md-toggle" type = "checkbox" id = "__toc" >
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< label class = "md-nav__link md-nav__link--active" for = "__toc" >
Debugging
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< a href = "./" class = "md-nav__link md-nav__link--active" >
Debugging
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< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
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< label class = "md-nav__title" for = "__toc" >
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Table of contents
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< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
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< a href = "#preliminary-information" class = "md-nav__link" >
Preliminary Information
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< / a >
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< nav class = "md-nav" aria-label = "Preliminary Information" >
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< li class = "md-nav__item" >
< a href = "#mail-sent-from-dms-does-not-arrive-at-destination" class = "md-nav__link" >
Mail sent from DMS does not arrive at destination
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< / ul >
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< li class = "md-nav__item" >
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< a href = "#steps-for-debugging-dms" class = "md-nav__link" >
Steps for Debugging DMS
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< nav class = "md-nav" aria-label = "Steps for Debugging DMS" >
< ul class = "md-nav__list" >
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< a href = "#debug-a-running-container" class = "md-nav__link" >
Debug a running container
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< li class = "md-nav__item" >
< a href = "../pop3/" class = "md-nav__link" >
Mail Delivery with POP3
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< li class = "md-nav__item" >
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< a href = "../setup.sh/" class = "md-nav__link" >
Your Friend setup.sh
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8" >
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< label class = "md-nav__link" for = "__nav_4_8" id = "__nav_4_8_label" tabindex = "0" >
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Advanced Configuration
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< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_8_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8" >
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< span class = "md-nav__icon md-icon" > < / span >
Advanced Configuration
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../advanced/optional-config/" class = "md-nav__link" >
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Optional Configuration
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_2" >
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< label class = "md-nav__link" for = "__nav_4_8_2" id = "__nav_4_8_2_label" tabindex = "0" >
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Maintenance
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< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_2_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_2" >
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< span class = "md-nav__icon md-icon" > < / span >
Maintenance
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../advanced/maintenance/update-and-cleanup/" class = "md-nav__link" >
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Update and Cleanup
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< / ul >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_3" >
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< label class = "md-nav__link" for = "__nav_4_8_3" id = "__nav_4_8_3_label" tabindex = "0" >
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Override the Default Configs
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< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_3_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_3" >
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< span class = "md-nav__icon md-icon" > < / span >
Override the Default Configs
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../advanced/override-defaults/dovecot/" class = "md-nav__link" >
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Dovecot
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< li class = "md-nav__item" >
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< a href = "../advanced/override-defaults/postfix/" class = "md-nav__link" >
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Postfix
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< / li >
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< li class = "md-nav__item" >
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< a href = "../advanced/override-defaults/user-patches/" class = "md-nav__link" >
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Modifications via Script
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< li class = "md-nav__item" >
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< a href = "../advanced/auth-ldap/" class = "md-nav__link" >
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LDAP Authentication
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Email Filtering with Sieve
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Email Gathering with Fetchmail
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Email Forwarding
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Relay Hosts
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AWS SES
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Kubernetes
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IPv6
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Dovecot Master Accounts
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Basic Installation
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Mailserver behind Proxy
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Building your own Docker image
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Blog Posts
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< a href = "../../examples/use-cases/forward-only-mailserver-with-ldap-authentication/" class = "md-nav__link" >
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Forward-Only Mail-Server with LDAP
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Customize IMAP Folders
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FAQ
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General Information
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Tests
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Issues and Pull Requests
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DockerHub
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< / li >
< li class = "md-nav__item" >
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< a href = "https://github.com/docker-mailserver/docker-mailserver/pkgs/container/docker-mailserver" class = "md-nav__link" >
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GHCR
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Preliminary Information
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< / a >
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< nav class = "md-nav" aria-label = "Preliminary Information" >
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Mail sent from DMS does not arrive at destination
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< / a >
< / li >
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Steps for Debugging DMS
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< / a >
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Debug a running container
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< h1 > Debugging< / h1 >
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< p > This page contains valuable information when it comes to resolving issues you encounter.< / p >
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< div class = "admonition info" >
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< p class = "admonition-title" > Contributions Welcome!< / p >
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< p > Please consider contributing solutions to the < a href = "../../faq/" > FAQ< / a > < img alt = "❤" class = "twemoji" src = "https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/svg/2764.svg" title = ":heart:" / > < / p >
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< / div >
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< h2 id = "preliminary-information" > < a class = "toclink" href = "#preliminary-information" > Preliminary Information< / a > < / h2 >
< h3 id = "mail-sent-from-dms-does-not-arrive-at-destination" > < a class = "toclink" href = "#mail-sent-from-dms-does-not-arrive-at-destination" > Mail sent from DMS does not arrive at destination< / a > < / h3 >
< p > Some service providers block outbound traffic on port 25. Common hosting providers known to have this issue:< / p >
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< ul >
< li > < a href = "https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity" > Azure< / a > < / li >
< li > < a href = "https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/" > AWS EC2< / a > < / li >
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< li > < a href = "https://www.vultr.com/docs/what-ports-are-blocked/" > Vultr< / a > < / li >
< / ul >
< p > These links may advise how the provider can unblock the port through additional services offered, or via a support ticket request.< / p >
< h2 id = "steps-for-debugging-dms" > < a class = "toclink" href = "#steps-for-debugging-dms" > Steps for Debugging DMS< / a > < / h2 >
< ol >
< li > < strong > Increase log verbosity< / strong > : Very helpful for troubleshooting problems during container startup. Set the environment variable < a href = "../environment/#log_level" > < code > LOG_LEVEL< / code > < / a > to < code > debug< / code > or < code > trace< / code > .< / li >
< li > < strong > Use error logs as a search query< / strong > : Try finding an < em > existing issue< / em > or < em > search engine result< / em > from any errors in your container log output. Often you'll find answers or more insights. If you still need to open an issue, sharing links from your search may help us assist you. The mail server log can be acquired by running < code > docker log < CONTAINER NAME> < / code > (< em > or < code > docker logs -f < CONTAINER NAME> < / code > if you want to follow the log< / em > ).< / li >
< li > < strong > Understand the basics of mail servers< / strong > : Especially for beginners, make sure you read our < a href = "../../introduction/" > Introduction< / a > and < a href = "../../usage/" > Usage< / a > articles.< / li >
< li > < strong > Search the whole FAQ< / strong > : Our < a href = "../../faq/" > FAQ< / a > contains answers for common problems. Make sure you go through the list.< / li >
< li > < strong > Reduce the scope< / strong > : Ensure that you can run a basic setup of DMS first. Then incrementally restore parts of your original configuration until the problem is reproduced again. If you're new to DMS, it is common to find the cause is misunderstanding how to configure a minimal setup.< / li >
< / ol >
< h3 id = "debug-a-running-container" > < a class = "toclink" href = "#debug-a-running-container" > Debug a running container< / a > < / h3 >
< p > To get a shell inside the container run: < code > docker exec -it < CONTAINER NAME> bash< / code > .< / p >
< p > If you need more flexibility than < code > docker logs< / code > offers, within the container < code > /var/log/mail/mail.log< / code > and < code > /var/log/supervisor/< / code > are the most useful locations to get relevant DMS logs. Use the < code > tail< / code > or < code > cat< / code > commands to view their contents.< / p >
< p > To install additional software:< / p >
< ul >
< li > < code > apt-get update< / code > is needed to update repository metadata.< / li >
< li > < code > apt-get install < PACKAGE> < / code > < / li >
< li > For example if you need a text editor, < code > nano< / code > is a good package choice for beginners.< / li >
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